Otto h



0. H. MOHR.

COLOR MATCHING LIGHT.

FILED FEB 19 1 I APP 911.

1,330,028. v Patented Feb. 3,1920.

A UnrrEI) STATES PATENT OFFIQE,

OTTO H. MOI-5B, 0F OAKLAND, osnrronnm, .essienon TO MOHR COMPANY, me, A

oQ-BBORA Io or nnLaWARE,

conon-mnrcnms LIGHT.

Specification of Letters Patent.

Patented Feb. 3., 1920..

npplication'filed February 19, 1917. Serial No. 149,410.

To all whom it may concern:

Be itknown thatI, O'r'ro H. MoHn, a citizen of the United States, residing at Oakland, in the county of Alameda and State of California, have invented a certain new and useful Color-Matching Light, of which the following is a specification. 7 My invention relates to that class of devices which are designed to reproduce the white light from an artificial source.

The object of myinvention is to produce an apparatus, which may be used in connection with an electric lamp or any other light source, and which will not only produce a spectrum similar to that of av north exposure of an ideal mid-early forenoon daylight, but which will give a spherical intensity of light of equal candle power and true color value.

It is well known that colors of fabric are obtained in one or two ways, either by the use of a pure dye or by mixing two different dyes together, for instance, two blues, dif ferently made; up, might match in one light, whereas with light of a different spectral composition, they would be differently affected, and hence would not match.

My invention provides a standard light of a given spectral composition, for the purpose of matching colors, and in many cases is more desirable than daylight,'for the reason that it constantly maintains a fixed value without variations Which of course is not true of daylight which varies continually both in color and intensity.

My means of accomplishing the foregoing objects may be more readily understood by having, reference to the accompanying drawings, which are hereunto annexed and are a part of this specification, in which:

Figure 1 is a side elevation of my improved color matching light.

Fig. 2 is a sectional View of the upper part of my device.

Similar reference numerals refer to similar parts throughout the entire description.

As shown in the drawings, the lightconsists of a semi-cylindrical member 1, the

upper half of which acts as a reflector. The other half of this cylinder is formed by' a plurality of specially prepared glass strips, arranged at a tangent to the perlphery of the cylinder, in such a manner that they will receive the direct rays emitted by the lamp and also the redirected rays coming from the reflecting part of the cylindrical mem ber 1, so that the objectionable rays are absorbed and the desirable ones are diffused and redirected from the surface ofthe glass strips.

It will be apparent from an inspection of Fig. 9, that these strips of glass 3, are in spaced relation and so arranged that. the direct rays will strike upon the specially prepared inner color screen, whichhas the result of absorbing the objectionable rays, while the useful ones will be forced to commingle and be diffused and reflected out upon a useful area, the tangential relationship of the strips being such that no direct light can pass between the strips to the working plane.

The glass strips or planes are made as set forth in my co-pending application, Serial No. 165,308, filed April 30, 1917, by coalescing certain colors of pure glass selected with direct relation to and in consideration of the spectrum of the light source, and which will act as an absorbing screen or color filter in order to correct the spectrum of the light source to that of a north exposure of a midearly forenoon daylight.

lVhile I have described the strips of glass as being formed of the glass constructed in accordance with my invention described in the co-pending application, above referred to it will be apparent to persons skilled in the art that my invention is not limited to that particular color filter, but the strips3, may be constructed in any desirable manner for the purpose of producing the desired light.

Preferably, the cylindrical member 1, which contains a light source A is provided with ends 4 and 5, which are pivotally secured to a harp 6, which is mounted upon a base 7, of any'desired style or configuration. It will be apparent from the foregoing'specification, that a light constructed in this manner will furnish a true spectrum at every point of the spherical art and that there will be no spot light resulting, as would come from a concentrated type of refiector, using the double color screen.

It will be apparent to persons skilled in the art that changes may be made in the specific form of a device without departing from the spirit of my invention, disclosed in the claims, and I therefore do not wish to be understood as limiting myself to the construction shown in the drawings and described in the specification.

Having described my invention what I regard as new, and desire to secure by Letters Patent is:

1. A color matching light comprising the combination with a light source of a cylinder surrounding said light source, a portion of the inner wall of said cylinder being formed into a reflecting surface, the remaining portion being formed of a plurality of strips of color filters arranged at an angle to a radius of the cylinder, said strips being spaced so that no direct light rays can escape from the cylinder.

2. A color matching light comprising th combination of a reflector member having a light emitting opening, having a light source within the reflector member, the opening of said refiectorbeing covered by a plurality of strips of glass, different portions of which are difl'erently colored, said strips being arranged in angular relation and spaced so that no direct light rays can escape.

3. A color matching light, comprising the combination with a light source, of a semil cylindrical member of opaque material, the internal surface of which is a reflector, a plurality of strips'of glass, different portions of which are differently colored, said strips being arranged in angular relation to the said cylindrical member, and s aced so that no direct light rays can escape rom the cylinder. 7

4. A color matching light, comprising the combination of a light source, of a cylinder surrounding said light source, a portion of the periphery of the cylinder being formed into a reflecting surface, the remaining portion being formed of a plurality of strips of color filters, arranged at a tangent to the circumference of the cylinder, said strips being spaced so that no light rays can escape from the cylinder without contacting with the color filters;

5; A color matching light, comprising the combination with alight source, of a cylinder surrounding said light source, a portion of the inner wall of said cylinder being formed into a reflectingsurface, the remain- 1ng portlon being formed of a plurahty of 7 strips of glass, different iortions of which are differently colored, said strips being ar ranged at an angle to a radius of the cylinder, and spaced so that no direct light rays can escape from the cylinder.

6. An apparatus for producing a modified light by means of an artificial illumina tion, which comprises means to reflect and direct the light rays downwardly upon light transforming devices s )aced apart and arranged in angular relation to the axis ofthe light rays whereby certain rays will be absorbed and a spectrum produced equivalent to a modified daylight;

In testimony whereofI have signed-the foregoing specification.

OTTO H. MOHR. 

